Brush connection.



J. NAYDOR.

BRUSH CONNECTION Patented Feb. 15, 1916.

TIT}.

INVENTOR. J U EN MAY]: 0 n

B Y 6( MW ATTORNEY WITNESSES JOHN NAYLGOR, OF LAKEWOOD, OHIO, ASSIGNQPRTO NATKONAL GARBOIZ' CJMPAHY, A

ooneonn'i'xon on one? mess anus CONHEQEION.

menses.

' Appllcotion filed 142mb :2, it

To (all whom it may concern. v

Be it known that I, J 0111 NAxDoR, o subject of the Emperor ofAustrinllungztry, residing Lakewood, in the county of Cuyahogs ,State ofOhio, have invented v a certain new and useful Improvement in BrushConnections, of which the following is s full,1cleer, and exactdesc'ription'.'

Thisinvention relates to festexiingigcom meeting cables to electriccontacts such as carbon brushes for dynamo electricv mm chines. In suchconnections flexible copper caloies known as pigtails are fastened 'tobrushes in elerge variety of Ways, for ex ample, icy bolting, soldering'01- riveting. Each of these types are furthermore used in any one of anumber of modifications each of which is especially adopted fonvoriousHis/BS. i

My invention relates to on improved type of pigtoil connection which ispermanently fastenedto thebrush without the use of solder, bolts,rivets, or by: introduction of any additional festeningmeons forattaching the pigtuil to the brush. 1

In the accompanying devings and de scription relating thereto, a methodof up plying o. pigtail without the use of edditionul elements isdisclosed, although it will be understood that my invention is not to belimited to the specific disclosure.

In the-drawings: Figure 1 is a cross section through the center of aconnection betore the end. of the cable is spun. Fig. 2 is a similarcross section with the cable drawn into the hole and u tool in positionto spin the cable. F 3 shows the brush with the cable spun. into thehole. Fig. l per spective View of one type of finished brush.

5 is e modified form of connection.

To form 2. connection the carbon brush 1 has two intersecting passagesor holes 2 and '3 drilled therein through which a pigtoil 4 is passed.The holes are preferably pei'pen dieulor to each other and drilled inthe faces as shown, but they could, of course, he drilled in otheifacesof the brush. The diameter of the opening 2 is slightly larger than thepigtoil and the diameter of the pets sage S is made still larger.

In making the connection the cable is pushed through holes 2 and 3 endscoil 5 formed one end. to fit into the hole 3. in

stead of forming a coil, the cable may he twisted, spluyed out orhunched at one end Specification of Letters Patent.

acted upon by 2.

Patented Fol). 1.5, 1916.

Serial No. 13,866.

ioiining the enlarged i 1, t is drawn cock note he ii; of

ale that is so Mi l %P-.:.ild. on to which the hole 3 is to he filledwhen completed.

in Fig. 2 the brush is,in position to be spinning tool 6 to spin itightly into the hole. The spinning tool consists of a rod ofapproximately the some dienieteros the hole 3, end is adopted to herotated rapidly by any means such as a drill C'hllQlI T. The spinningtool simultaneously twists and. compresses the fine copper. of the cableto densely compact them therein and ceuse them to press into and adhereto the sides of the hole. The spinning tool forces the copper wire down.the hole to 2: level considerably below the "face of the brushond makesa smooth, burnished coo per surface. The Jun copper strunzls, 1. feet,look like exactly fitted into the hole 3. The amount a polished, solidcopper disk of material in the coil 5 is preferably made sufficient togive it disk of somewhat greater thickness than the diameter of the holeIn making a connection. of the t" in the form shown in Fig. 53-, theunfiiled port of the opening 3 is filled with suitable filling materialsuch cement 8. Ordinarily this is not necessary, but if an iron, cop

per, or other current conducting cement is used, the conduct vity andmechanical strength is still furt er increased.

Connections using a spun pigteil are less e 'pensive to nienufoctui'enose the drillin involved is no more ordinarily re lured for mostconnections. The new connection is exceptionally nest in appearonce andadopted for use with practically all types of brush holders. lowresistance which it is fou'iid to possess may be attrihutcd to combinedspiiining and pressure forcing the fine copper wires, which are veryflexible, into such intimate contact with the carbon n shown,considerable thlckness of the disk is ale-sin into the'opening and thespinning the gcod'oontoct secured by the nnels 45 min 1 into ed ed inton; cout and "with sni:

their tor in said um i133 tcndin mcls with one and spin 5 of one chunn(is in in he channel.

tersectmg (tha 01301:

the will];

such Null 7 a cam;

avmg a condu \midea mu m J 0i 2,

'wg 1n it h spun

spinning the h lowed inw comluct w 41' and 0 mi (1. p :1 ct m ct intimawthe channel

